A352606 Expansion of e.g.f. tan(cos(x) - 1) (even part).

0, -1, 1, -31, 421, -19531, 873841, -67417351, 6079224061, -745862759491, 109749390119881, -20006355219508351, 4313763491717212501, -1101230418170874812731, 326019382476444960095521, -111246859639685180908387831, 43247270290320815515213664941

Offset

0,4

Links

Table of n, a(n) for n=0..16.

Prog

(PARI) my(N=40, x='x+O('x^N)); v=Vec(serlaplace(tan(cos(x)-1))); concat(0, vector(#v\2, k, v[2*k-1]))

Crossrefs

Cf. A000182, A003705, A192007, A192060.

Sequence in context: A068658 A068672 A274202 * A089561 A134072 A134071

Adjacent sequences: A352603 A352604 A352605 * A352607 A352608 A352609

Keyword

sign

Author

Seiichi Manyama, Mar 23 2022

Status

approved